if {[catch {

proc is_without_rowid {tname} {

set t [string map {' ''} $tname]

db eval "PRAGMA index_list = '$t'" o {

if {$o(origin) == "pk"} {

set n $o(name)

if {0==[db one { SELECT count(*) FROM sqlite_master WHERE name=$n }]} {

return 1

}

}

}

return 0

}

proc tclsh {} {

set line {}

while {![eof stdin]} {

if {$line!=""} {

puts -nonewline "> "

} else {

puts -nonewline "% "

}

flush stdout

append line [gets stdin]

if {[info complete $line]} {

if {[catch {uplevel #0 $line} result]} {

puts stderr "Error: $result"

} elseif {$result!=""} {

puts $result

}

set line {}

} else {

append line \n

}

}

}

proc usage {} {

set argv0 [file rootname [file tail [info nameofexecutable]]]

puts stderr "Usage: $argv0 ?--pageinfo? ?--stats? database-filename"

puts stderr {

Analyze the SQLite3 database file specified by the "database-filename"

argument and output a report detailing size and storage efficiency

information for the database and its constituent tables and indexes.

Options:

--pageinfo Show how each page of the database-file is used

--stats Output SQL text that creates a new database containing

statistics about the database that was analyzed

--tclsh Run the built-in TCL interpreter interactively (for debugging)

--version Show the version number of SQLite

}

exit 1

}

set file_to_analyze {}

set flags(-pageinfo) 0

set flags(-stats) 0

set flags(-debug) 0

append argv {}

foreach arg $argv {

if {[regexp {^-+pageinfo$} $arg]} {

set flags(-pageinfo) 1

} elseif {[regexp {^-+stats$} $arg]} {

set flags(-stats) 1

} elseif {[regexp {^-+debug$} $arg]} {

set flags(-debug) 1

} elseif {[regexp {^-+tclsh$} $arg]} {

tclsh

exit 0

} elseif {[regexp {^-+version$} $arg]} {

sqlite3 mem :memory:

puts [mem one {SELECT sqlite_version()||' '||sqlite_source_id()}]

mem close

exit 0

} elseif {[regexp {^-} $arg]} {

puts stderr "Unknown option: $arg"

usage

} elseif {$file_to_analyze!=""} {

usage

} else {

set file_to_analyze $arg

}

}

if {$file_to_analyze==""} usage

set root_filename $file_to_analyze

regexp {^file:(//)?([^?]*)} $file_to_analyze all x1 root_filename

if {![file exists $root_filename]} {

puts stderr "No such file: $root_filename"

exit 1

}

if {![file readable $root_filename]} {

puts stderr "File is not readable: $root_filename"

exit 1

}

set true_file_size [file size $root_filename]

if {$true_file_size<512} {

puts stderr "Empty or malformed database: $root_filename"

exit 1

}

set extension [file extension $root_filename]

set pattern $root_filename

append pattern {[0-3][0-9][0-9]}

foreach f [glob -nocomplain $pattern] {

incr true_file_size [file size $f]

set extension {}

}

if {[string length $extension]>=2 && [string length $extension]<=4} {

set pattern [file rootname $root_filename]

append pattern {.[0-3][0-9][0-9]}

foreach f [glob -nocomplain $pattern] {

incr true_file_size [file size $f]

}

}

if {[catch {sqlite3 db $file_to_analyze -uri 1} msg]} {

puts stderr "error trying to open $file_to_analyze: $msg"

exit 1

}

if {$flags(-debug)} {

proc dbtrace {txt} {puts $txt; flush stdout;}

db trace ::dbtrace

}

if {![db exists {SELECT 1 FROM pragma_compile_options

WHERE compile_options='ENABLE_DBSTAT_VTAB'}]} {

puts "The SQLite database engine linked with this application\

exit 1

}

db eval {SELECT count(*) FROM sqlite_master}

set pageSize [expr {wide([db one {PRAGMA page_size}])}]

if {$flags(-pageinfo)} {

db eval {CREATE VIRTUAL TABLE temp.stat USING dbstat}

db eval {SELECT name, path, pageno FROM temp.stat ORDER BY pageno} {

puts "$pageno $name $path"

}

exit 0

}

if {$flags(-stats)} {

db eval {CREATE VIRTUAL TABLE temp.stat USING dbstat}

puts "BEGIN;"

puts "CREATE TABLE stats("

puts " name STRING, /* Name of table or index */"

puts " path INTEGER, /* Path to page from root */"

puts " pageno INTEGER, /* Page number */"

puts " pagetype STRING, /* 'internal', 'leaf' or 'overflow' */"

puts " ncell INTEGER, /* Cells on page (0 for overflow) */"

puts " payload INTEGER, /* Bytes of payload on this page */"

puts " unused INTEGER, /* Bytes of unused space on this page */"

puts " mx_payload INTEGER, /* Largest payload size of all cells */"

puts " pgoffset INTEGER, /* Offset of page in file */"

puts " pgsize INTEGER /* Size of the page */"

puts ");"

db eval {SELECT quote(name) || ',' ||

quote(path) || ',' ||

quote(pageno) || ',' ||

quote(pagetype) || ',' ||

quote(ncell) || ',' ||

quote(payload) || ',' ||

quote(unused) || ',' ||

quote(mx_payload) || ',' ||

quote(pgoffset) || ',' ||

quote(pgsize) AS x FROM stat} {

puts "INSERT INTO stats VALUES($x);"

}

puts "COMMIT;"

exit 0

}

sqlite3 mem :memory:

if {$flags(-debug)} {

proc dbtrace {txt} {puts $txt; flush stdout;}

mem trace ::dbtrace

}

set tabledef {CREATE TABLE space_used(

name clob, -- Name of a table or index in the database file

tblname clob, -- Name of associated table

is_index boolean, -- TRUE if it is an index, false for a table

is_without_rowid boolean, -- TRUE if WITHOUT ROWID table

nentry int, -- Number of entries in the BTree

leaf_entries int, -- Number of leaf entries

depth int, -- Depth of the b-tree

payload int, -- Total amount of data stored in this table or index

ovfl_payload int, -- Total amount of data stored on overflow pages

ovfl_cnt int, -- Number of entries that use overflow

mx_payload int, -- Maximum payload size

int_pages int, -- Number of interior pages used

leaf_pages int, -- Number of leaf pages used

ovfl_pages int, -- Number of overflow pages used

int_unused int, -- Number of unused bytes on interior pages

leaf_unused int, -- Number of unused bytes on primary pages

ovfl_unused int, -- Number of unused bytes on overflow pages

gap_cnt int, -- Number of gaps in the page layout

compressed_size int -- Total bytes stored on disk

);}

mem eval $tabledef

db eval {CREATE VIRTUAL TABLE temp.stat USING dbstat}

db eval {CREATE TEMP TABLE dbstat AS SELECT * FROM temp.stat

ORDER BY name, path}

db eval {DROP TABLE temp.stat}

set isCompressed 0

set compressOverhead 0

set depth 0

set sql { SELECT name, tbl_name FROM sqlite_master WHERE rootpage>0 }

foreach {name tblname} [concat sqlite_master sqlite_master [db eval $sql]] {

set is_index [expr {$name!=$tblname}]

set is_without_rowid [is_without_rowid $name]

db eval {

SELECT

sum(ncell) AS nentry,

sum((pagetype=='leaf')*ncell) AS leaf_entries,

sum(payload) AS payload,

sum((pagetype=='overflow') * payload) AS ovfl_payload,

sum(path LIKE '%+000000') AS ovfl_cnt,

max(mx_payload) AS mx_payload,

sum(pagetype=='internal') AS int_pages,

sum(pagetype=='leaf') AS leaf_pages,

sum(pagetype=='overflow') AS ovfl_pages,

sum((pagetype=='internal') * unused) AS int_unused,

sum((pagetype=='leaf') * unused) AS leaf_unused,

sum((pagetype=='overflow') * unused) AS ovfl_unused,

sum(pgsize) AS compressed_size,

max((length(CASE WHEN path LIKE '%+%' THEN '' ELSE path END)+3)/4)

AS depth

FROM temp.dbstat WHERE name = $name

} break

set total_pages [expr {$leaf_pages+$int_pages+$ovfl_pages}]

set storage [expr {$total_pages*$pageSize}]

if {!$isCompressed && $storage>$compressed_size} {

set isCompressed 1

set compressOverhead 14

}

# Column 'gap_cnt' is set to the number of non-contiguous entries in the

# list of pages visited if the b-tree structure is traversed in a top-down

# fashion (each node visited before its child-tree is passed). Any overflow

# chains present are traversed from start to finish before any child-tree

# is.

#

set gap_cnt 0

set prev 0

db eval {

SELECT pageno, pagetype FROM temp.dbstat

WHERE name=$name

ORDER BY pageno

} {

if {$prev>0 && $pagetype=="leaf" && $pageno!=$prev+1} {

incr gap_cnt

}

set prev $pageno

}

mem eval {

INSERT INTO space_used VALUES(

$name,

$tblname,

$is_index,

$is_without_rowid,

$nentry,

$leaf_entries,

$depth,

$payload,

$ovfl_payload,

$ovfl_cnt,

$mx_payload,

$int_pages,

$leaf_pages,

$ovfl_pages,

$int_unused,

$leaf_unused,

$ovfl_unused,

$gap_cnt,

$compressed_size

);

}

}

proc integerify {real} {

if {[string is double -strict $real]} {

return [expr {wide($real)}]

} else {

return 0

}

}

mem function int integerify

proc quote {txt} {

return [string map {' ''} $txt]

}

proc titleline {title} {

if {$title==""} {

puts [string repeat * 79]

} else {

set len [string length $title]

set stars [string repeat * [expr 79-$len-5]]

puts "*** $title $stars"

}

}

proc statline {title value {extra {}}} {

set len [string length $title]

set dots [string repeat . [expr 50-$len]]

set len [string length $value]

set sp2 [string range { } $len end]

if {$extra ne ""} {

set extra " $extra"

}

puts "$title$dots $value$sp2$extra"

}

proc percent {num denom {of {}}} {

if {$denom==0.0} {return ""}

set v [expr {$num*100.0/$denom}]

set of {}

if {$v==100.0 || $v<0.001 || ($v>1.0 && $v<99.0)} {

return [format {%5.1f%% %s} $v $of]

} elseif {$v<0.1 || $v>99.9} {

return [format {%7.3f%% %s} $v $of]

} else {

return [format {%6.2f%% %s} $v $of]

}

}

proc divide {num denom} {

if {$denom==0} {return 0.0}

return [format %.2f [expr double($num)/double($denom)]]

}

proc subreport {title where showFrag} {

global pageSize file_pgcnt compressOverhead

# Query the in-memory database for the sum of various statistics

# for the subset of tables/indices identified by the WHERE clause in

# $where. Note that even if the WHERE clause matches no rows, the

# following query returns exactly one row (because it is an aggregate).

#

# The results of the query are stored directly by SQLite into local

# variables (i.e. $nentry, $payload etc.).

#

mem eval "

FROM space_used WHERE $where" {} {}

# Output the sub-report title, nicely decorated with * characters.

#

puts ""

titleline $title

puts ""

# Calculate statistics and store the results in TCL variables, as follows:

#

# total_pages: Database pages consumed.

# total_pages_percent: Pages consumed as a percentage of the file.

# storage: Bytes consumed.

# payload_percent: Payload bytes used as a percentage of $storage.

# total_unused: Unused bytes on pages.

# avg_payload: Average payload per btree entry.

# avg_fanout: Average fanout for internal pages.

# avg_unused: Average unused bytes per btree entry.

# avg_meta: Average metadata overhead per entry.

# ovfl_cnt_percent: Percentage of btree entries that use overflow pages.

#

set total_pages [expr {$leaf_pages+$int_pages+$ovfl_pages}]

set total_pages_percent [percent $total_pages $file_pgcnt]

set storage [expr {$total_pages*$pageSize}]

set payload_percent [percent $payload $storage {of storage consumed}]

set total_unused [expr {$ovfl_unused+$int_unused+$leaf_unused}]

set avg_payload [divide $payload $nentry]

set avg_unused [divide $total_unused $nentry]

set total_meta [expr {$storage - $payload - $total_unused}]

set total_meta [expr {$total_meta + 4*($ovfl_pages - $ovfl_cnt)}]

set meta_percent [percent $total_meta $storage {of metadata}]

set avg_meta [divide $total_meta $nentry]

if {$int_pages>0} {

# TODO: Is this formula correct?

set nTab [mem eval "

"]

set avg_fanout [mem eval "

"]

set avg_fanout [format %.2f $avg_fanout]

}

set ovfl_cnt_percent [percent $ovfl_cnt $nentry {of all entries}]

# Print out the sub-report statistics.

#

statline {Percentage of total database} $total_pages_percent

statline {Number of entries} $nentry

statline {Bytes of storage consumed} $storage

if {$compressed_size!=$storage} {

set compressed_size [expr {$compressed_size+$compressOverhead*$total_pages}]

set pct [expr {$compressed_size*100.0/$storage}]

set pct [format {%5.1f%%} $pct]

statline {Bytes used after compression} $compressed_size $pct

}

statline {Bytes of payload} $payload $payload_percent

statline {Bytes of metadata} $total_meta $meta_percent

if {$cnt==1} {statline {B-tree depth} $depth}

statline {Average payload per entry} $avg_payload

statline {Average unused bytes per entry} $avg_unused

statline {Average metadata per entry} $avg_meta

if {[info exists avg_fanout]} {

statline {Average fanout} $avg_fanout

}

if {$showFrag && $total_pages>1} {

set fragmentation [percent $gap_cnt [expr {$total_pages-1}]]

statline {Non-sequential pages} $gap_cnt $fragmentation

}

statline {Maximum payload per entry} $mx_payload

statline {Entries that use overflow} $ovfl_cnt $ovfl_cnt_percent

if {$int_pages>0} {

statline {Index pages used} $int_pages

}

statline {Primary pages used} $leaf_pages

statline {Overflow pages used} $ovfl_pages

statline {Total pages used} $total_pages

if {$int_unused>0} {

set int_unused_percent [

percent $int_unused [expr {$int_pages*$pageSize}] {of index space}]

statline "Unused bytes on index pages" $int_unused $int_unused_percent

}

statline "Unused bytes on primary pages" $leaf_unused [

percent $leaf_unused [expr {$leaf_pages*$pageSize}] {of primary space}]

statline "Unused bytes on overflow pages" $ovfl_unused [

percent $ovfl_unused [expr {$ovfl_pages*$pageSize}] {of overflow space}]

statline "Unused bytes on all pages" $total_unused [

percent $total_unused $storage {of all space}]

return 1

}

proc autovacuum_overhead {filePages pageSize} {

# Set $autovacuum to non-zero for databases that support auto-vacuum.

set autovacuum [db one {PRAGMA auto_vacuum}]

# If the database is not an auto-vacuum database or the file consists

# of one page only then there is no overhead for auto-vacuum. Return zero.

if {0==$autovacuum || $filePages==1} {

return 0

}

# The number of entries on each pointer map page. The layout of the

# database file is one pointer-map page, followed by $ptrsPerPage other

# pages, followed by a pointer-map page etc. The first pointer-map page

# is the second page of the file overall.

set ptrsPerPage [expr double($pageSize/5)]

# Return the number of pointer map pages in the database.

return [expr wide(ceil( ($filePages-1.0)/($ptrsPerPage+1.0) ))]

}

if 0 {

set file_bytes [file size $file_to_analyze]

set file_pgcnt [expr {$file_bytes/$pageSize}]

}

set file_pgcnt [db one {PRAGMA page_count}]

set file_bytes [expr {$file_pgcnt * $pageSize}]

set av_pgcnt [autovacuum_overhead $file_pgcnt $pageSize]

set av_percent [percent $av_pgcnt $file_pgcnt]

set sql {SELECT sum(leaf_pages+int_pages+ovfl_pages) FROM space_used}

set inuse_pgcnt [expr wide([mem eval $sql])]

set inuse_percent [percent $inuse_pgcnt $file_pgcnt]

set free_pgcnt [expr {$file_pgcnt-$inuse_pgcnt-$av_pgcnt}]

set free_percent [percent $free_pgcnt $file_pgcnt]

set free_pgcnt2 [db one {PRAGMA freelist_count}]

set free_percent2 [percent $free_pgcnt2 $file_pgcnt]

set file_pgcnt2 [expr {$inuse_pgcnt+$free_pgcnt2+$av_pgcnt}]

set ntable [db eval {SELECT count(*)+1 FROM sqlite_master WHERE type='table'}]

set nindex [db eval {SELECT count(*) FROM sqlite_master WHERE type='index'}]

set sql {SELECT count(*) FROM sqlite_master WHERE name LIKE 'sqlite_autoindex%'}

set nautoindex [db eval $sql]

set nmanindex [expr {$nindex-$nautoindex}]

set user_payload [mem one {SELECT int(sum(payload)) FROM space_used

WHERE NOT is_index AND name NOT LIKE 'sqlite_master'}]

set user_percent [percent $user_payload $file_bytes]

puts "/** Disk-Space Utilization Report For $root_filename"

puts ""

statline {Page size in bytes} $pageSize

statline {Pages in the whole file (measured)} $file_pgcnt

statline {Pages in the whole file (calculated)} $file_pgcnt2

statline {Pages that store data} $inuse_pgcnt $inuse_percent

statline {Pages on the freelist (per header)} $free_pgcnt2 $free_percent2

statline {Pages on the freelist (calculated)} $free_pgcnt $free_percent

statline {Pages of auto-vacuum overhead} $av_pgcnt $av_percent

statline {Number of tables in the database} $ntable

statline {Number of indices} $nindex

statline {Number of defined indices} $nmanindex

statline {Number of implied indices} $nautoindex

if {$isCompressed} {

statline {Size of uncompressed content in bytes} $file_bytes

set efficiency [percent $true_file_size $file_bytes]

statline {Size of compressed file on disk} $true_file_size $efficiency

} else {

statline {Size of the file in bytes} $file_bytes

}

statline {Bytes of user payload stored} $user_payload $user_percent

puts ""

titleline "Page counts for all tables with their indices"

puts ""

mem eval {SELECT tblname, count(*) AS cnt,

int(sum(int_pages+leaf_pages+ovfl_pages)) AS size

FROM space_used GROUP BY tblname ORDER BY size+0 DESC, tblname} {} {

statline [string toupper $tblname] $size [percent $size $file_pgcnt]

}

puts ""

titleline "Page counts for all tables and indices separately"

puts ""

mem eval {

SELECT

upper(name) AS nm,

int(int_pages+leaf_pages+ovfl_pages) AS size

FROM space_used

ORDER BY size+0 DESC, name} {} {

statline $nm $size [percent $size $file_pgcnt]

}

if {$isCompressed} {

puts ""

titleline "Bytes of disk space used after compression"

puts ""

set csum 0

mem eval {SELECT tblname,

int(sum(compressed_size)) +

$compressOverhead*sum(int_pages+leaf_pages+ovfl_pages)

AS csize

FROM space_used GROUP BY tblname ORDER BY csize+0 DESC, tblname} {} {

incr csum $csize

statline [string toupper $tblname] $csize [percent $csize $true_file_size]

}

set overhead [expr {$true_file_size - $csum}]

if {$overhead>0} {

statline {Header and free space} $overhead [percent $overhead $true_file_size]

}

}

if {$nindex>0} {

subreport {All tables and indices} 1 0

}

subreport {All tables} {NOT is_index} 0

if {$nindex>0} {

subreport {All indices} {is_index} 0

}

foreach tbl [mem eval {SELECT DISTINCT tblname name FROM space_used

ORDER BY name}] {

set qn [quote $tbl]

set name [string toupper $tbl]

set n [mem eval {SELECT count(*) FROM space_used WHERE tblname=$tbl}]

if {$n>1} {

set idxlist [mem eval "SELECT name FROM space_used

ORDER BY 1"]

subreport "Table $name and all its indices" "tblname='$qn'" 0

subreport "Table $name w/o any indices" "name='$qn'" 1

if {[llength $idxlist]>1} {

subreport "Indices of table $name" "tblname='$qn' AND is_index" 0

}

foreach idx $idxlist {

set qidx [quote $idx]

subreport "Index [string toupper $idx] of table $name" "name='$qidx'" 1

}

} else {

subreport "Table $name" "name='$qn'" 1

}

}

puts ""

titleline Definitions

puts {

Page size in bytes

The number of bytes in a single page of the database file.

Usually 1024.

Number of pages in the whole file

}

puts " The number of $pageSize-byte pages that go into forming the complete

puts {

Pages that store data

The number of pages that store data, either as primary B*Tree pages or

as overflow pages. The number at the right is the data pages divided by

the total number of pages in the file.

Pages on the freelist

The number of pages that are not currently in use but are reserved for

future use. The percentage at the right is the number of freelist pages

divided by the total number of pages in the file.

Pages of auto-vacuum overhead

The number of pages that store data used by the database to facilitate

auto-vacuum. This is zero for databases that do not support auto-vacuum.

Number of tables in the database

The number of tables in the database, including the SQLITE_MASTER table

used to store schema information.

Number of indices

The total number of indices in the database.

Number of defined indices

The number of indices created using an explicit CREATE INDEX statement.

Number of implied indices

The number of indices used to implement PRIMARY KEY or UNIQUE constraints

on tables.

Size of the file in bytes

The total amount of disk space used by the entire database files.

Bytes of user payload stored

The total number of bytes of user payload stored in the database. The

schema information in the SQLITE_MASTER table is not counted when

computing this number. The percentage at the right shows the payload

divided by the total file size.

Percentage of total database

The amount of the complete database file that is devoted to storing

information described by this category.

Number of entries

The total number of B-Tree key/value pairs stored under this category.

Bytes of storage consumed

The total amount of disk space required to store all B-Tree entries

under this category. The is the total number of pages used times

the pages size.

Bytes of payload

The amount of payload stored under this category. Payload is the data

part of table entries and the key part of index entries. The percentage

at the right is the bytes of payload divided by the bytes of storage

consumed.

Bytes of metadata

The amount of formatting and structural information stored in the

table or index. Metadata includes the btree page header, the cell pointer

array, the size field for each cell, the left child pointer or non-leaf

cells, the overflow pointers for overflow cells, and the rowid value for

rowid table cells. In other words, metadata is everything that is neither

unused space nor content. The record header in the payload is counted as

content, not metadata.

Average payload per entry

The average amount of payload on each entry. This is just the bytes of

payload divided by the number of entries.

Average unused bytes per entry

The average amount of free space remaining on all pages under this

category on a per-entry basis. This is the number of unused bytes on

all pages divided by the number of entries.

Non-sequential pages

The number of pages in the table or index that are out of sequence.

Many filesystems are optimized for sequential file access so a small

number of non-sequential pages might result in faster queries,

especially for larger database files that do not fit in the disk cache.

Note that after running VACUUM, the root page of each table or index is

at the beginning of the database file and all other pages are in a

separate part of the database file, resulting in a single non-

sequential page.

Maximum payload per entry

The largest payload size of any entry.

Entries that use overflow

The number of entries that user one or more overflow pages.

Total pages used

This is the number of pages used to hold all information in the current

category. This is the sum of index, primary, and overflow pages.

Index pages used

This is the number of pages in a table B-tree that hold only key (rowid)

information and no data.

Primary pages used

This is the number of B-tree pages that hold both key and data.

Overflow pages used

The total number of overflow pages used for this category.

Unused bytes on index pages

The total number of bytes of unused space on all index pages. The

percentage at the right is the number of unused bytes divided by the

total number of bytes on index pages.

Unused bytes on primary pages

The total number of bytes of unused space on all primary pages. The

percentage at the right is the number of unused bytes divided by the

total number of bytes on primary pages.

Unused bytes on overflow pages

The total number of bytes of unused space on all overflow pages. The

percentage at the right is the number of unused bytes divided by the

total number of bytes on overflow pages.

Unused bytes on all pages

The total number of bytes of unused space on all primary and overflow

pages. The percentage at the right is the number of unused bytes

divided by the total number of bytes.

}

titleline {}

puts "The entire text of this report can be sourced into any SQL database"

puts "engine for further analysis. All of the text above is an SQL comment."

puts "The data used to generate this report follows:"

puts "*/"

puts "BEGIN;"

puts $tabledef

unset -nocomplain x

mem eval {SELECT * FROM space_used} x {

puts -nonewline "INSERT INTO space_used VALUES"

set sep (

foreach col $x(*) {

set v $x($col)

if {$v=="" || ![string is double $v]} {set v '[quote $v]'}

puts -nonewline $sep$v

set sep ,

}

puts ");"

}

puts "COMMIT;"

} err]} {

puts "ERROR: $err"

puts $errorInfo

exit 1

}